2017A&A...608A.132K


Query : 2017A&A...608A.132K

2017A&A...608A.132K - Astronomy and Astrophysics, volume 608A, 132-132 (2017/12-1)

Detection of a repeated transit signature in the light curve of the enigma star KIC 8462852: A possible 928-day period.

KIEFER F., LECAVELIER DES ETANGS A., VIDAL-MADJAR A., HEBRARD G., BOURRIER V. and WILSON P.A.

Abstract (from CDS):

As revealed by its peculiar Kepler light curve, the enigmatic star KIC 8462852 undergoes short and deep flux dimmings at a priori unrelated epochs. This star presents nonetheless all other characteristics of a quiet 1Gyr old F3V star. These dimmings resemble the absorption features expected for the transit of dust cometary tails. The exocomet scenario is therefore most commonly advocated. We reanalysed the Kepler data and extracted a new high-quality light curve to allow for the search of shallow signatures of single or a few exocomets. We discovered that among the 22 flux dimming events that we identified, two events present a striking similarity. These events occurred 928.25 days apart and lasted for 4.4 days with a drop in the star brightness by 1000 ppm. We show that the light curve of these events is well explained by the occultation of the star by a giant ring system or by the transit of a string of half a dozen exocomets with a typical dust production rate of 105-106kg/s. Assuming that these two similar events are related to the transit of the same object, we derive a period of 928.25 days. The following transit was expected in March 2017 but bad weather prohibited us from detecting it from ground-based spectroscopy. We predict that the next event will occur between 3-8 October 2019.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: individual: KIC 8462852 - techniques: photometric - comets: general - planets and satellites: rings - planets and satellites: rings

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 * 49 Cet PM* 01 34 37.7786780856 -15 40 34.898673000   5.667 5.607   5.54 A1V 305 0
2 ASAS J140748-3945.7 Y*O 14 07 47.9297625720 -39 45 42.767059968   13.56 12.31 11.91 10.92 K5IVe 68 0
3 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1336 1
4 HD 172555 PM* 18 45 26.9009806435 -64 52 16.534807985   4.967 4.767     A7V 282 0
5 GSC 03162-00665 Er* 20 06 15.4526521026 +44 27 24.790869158   12.82 12.01 11.75   F3V 140 0
6 2MASS J20061551+4427330 NIR 20 06 15.5330317056 +44 27 33.297239376           ~ 2 0
7 2MASS J20061594+4427365 * 20 06 15.9620891832 +44 27 36.501911136           ~ 2 0
8 TYC 3162-677-1 HB* 20 06 23.6441489784 +44 27 38.261254320   12.95 11.51     ~ 26 0
9 * alf PsA b Pl 22 57 39.04625 -29 37 20.0533           ~ 201 1

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